Coupler for waveguides of differing cross section

Details Coupler for waveguides of differing cross section Coupler for waveguides of differing cross section

1992-12-18

1994-02-08

Lee, John D.

Optical waveguides

With optical coupler

Input/output coupler

385 43, 385 50, 385133, G02B 632

Patent

active

052855090

ABSTRACT:
A waveguide coupler for coupling electromagnetic power between a first rectangular waveguide and a second rectangular waveguide includes a one-dimensional intermediate waveguide formed of two plates spaced apart by a distance equal to a common height of the two waveguides. This enables a wave emanating from the first waveguide to spread apart transversely so as to equal the width of the second waveguide, the width of the second waveguide being greater than the width of the first waveguide. A cylindrical lens is located between the intermediate waveguide and the second waveguide to provide for a conversion between a cylindrical wavefront and a planar wavefront. The coupler is operative in reciprocal fashion such that a wave emanating from the first waveguide spreads out in width and is then converted to a planar waveguide prior to entering the second waveguide; and a wave emanating from the second waveguide is converted to a wave of contracting width for entry into the first waveguide. In each of the first and the second waveguides, the waveguide has an open end which serves as a port by which electromagnetic power is coupled between the waveguide and the intermediate waveguide. In an alternative embodiment, the intermediate waveguide may be fabricated as a block of solid electromagnetic-wave propagating material.

REFERENCES:
patent: 3949318 (1976-04-01), Zeidler
patent: 4128302 (1978-12-01), Di Vita
patent: 4178066 (1979-12-01), Di Vita

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